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Theses

Caractérisation locale des couples de matériaux mis en jeu lors du contact rotor/stator dans une turbomachine

Abstract : Increasing efficiency of aircraft engines require optimization of the clearance between the rotor and the stator. However, the important thermo-mechanical solicitations undergone by the engines lead to unavoidable high speed interactions between the moving parts and the casing. To achieve reduced clearance without endangering the blading, abradable seals are deposited inside the casing. This coating is designed to wear out in case of contact with the blade tip. Characterization and understanding of the different phenomena which take place during interactions are essential to prevent premature failure and to design safer aircraft engines but accurate modeling of these phenomena requires experimental data which are difficult to obtain because of the extreme conditions in which contacts occur (500 m/s, 300 °C) and of the complexity of the involved materials. The purpose of this work is to provide new experimental data relating to the forces generated during blade-casing contacts. Thus, a new experimental technique has been developed in order to generate high speed interactions between a tool impersonating a blade tip and a sample of abradable material and to measure the interaction forces. Because of the high interaction velocities reached up, a signal correction method has been implemented. Finally, this new experimental technique has been applied on the characterization of the abradable material Metco M601 used in low-pressure compressor of commercial aircraft engines. The influence on the interaction forces of the blade velocity, the incursion depth and the mechanical and geometrical characteristics of the blade tip has been studied
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https://hal.univ-lorraine.fr/tel-01749230
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  • HAL Id : tel-01749230, version 1

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Marion Cuny. Caractérisation locale des couples de matériaux mis en jeu lors du contact rotor/stator dans une turbomachine. Autre. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0059⟩. ⟨tel-01749230⟩

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